GRACErr: a program for calculating spatially decorrelated errors of GRACE satellite data, written by Dr. Dowd (UGA) and me can be obtained up on request by email
Meteorological data (e.g., precipitation, air temperature) input for SWAT hydrologic model, including software products can be downloaded from SWAT website
Automation codes for satellite images processing (awesome to accomplish multiple tasks with multiple files, I mean 1000s, at a time). For MODIS/AMSRE products use MRT tool or HEG
Access to gauged data in the US for climatology – NOAA and groundwater and stream flow – USGS
PRISM precipitation data (nearly 4 km resolution) for the conterminous US
CHIRPS – up to 0.05 Deg resolution Global rainfall data (1981-present)